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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faee45e4024c469d51eb82a33b08e9c1c22d226bd6b83b3a92f0ea2d7398e9fd' 
  AND token = 'OPVk1yyyS3Ms+tQHYoE5Lm+bdsFx0PLS9i9JC7HGW+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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