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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'affb8e279d493fec3f3c66930779da4ad80371080e9e1ab4ce3934289b922bf3' 
  AND token = 'Oqy7q70/CUF46dZd6OPSXVaccw9ivkJAxEeWe/I4wsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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