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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d4d3445e2f0f21d622f74a0e44e0d6c72d3dbddf20a44db2e46deb2835cf07e' 
  AND token = 'giVXmOiHi0av8lnuY+QK7v455nUO2crFacFJQ69T3rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00177

JSON explain

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