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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c831269f9a542ad56596bf08df5048ad45a05af1ed4379dc52bf65f49726d01' 
  AND token = 'FmGV49uFtvKo83MbVnCj5aBVi6MDToZT88ELDsmayRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}