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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e2544a9c2d9f9968ce77ed1a2047f69ae639cae6264d177182c90c2037f495a' 
  AND token = 'NrrNgDS7Ri8Hy6FpgTgaclHCsW5g35R8axC4OBSA498=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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