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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b144cdd3cab75572bcbb303051d00424b2d1c6e20379408df510cbad612bba35' 
  AND token = 'X44vrQaNkg591oifWS1GvsPiph/tulfC26MUjBH/cLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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