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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba8ab1a53265878b22ee5ae2a2d40d1d65ae90143d78beb0e13696078b1bf05d' 
  AND token = 'O90ksovCJzPsH8sPIcFE/b1U05qEcjO9L5yZZky/8dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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