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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6ebf853ed74fef7c6db8dc0b13bce7fef585ed46861b3e3e937f06d1362a9ab' 
  AND token = '/oaVeQOw55t54vY322PdpXTeGQ+lsoc1mULh/M1/dpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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