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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee117f83ec0036f65feb044b27ce63eb795c8f9b5a6b5820a5d970b06085521e' 
  AND token = 'siP1mPQmpHaSfF08TIeSlv9/gSYDn8fFrn30n7Glkk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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