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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f09a3fb6b1af053b819f260e155afbe53375ed5d6a243fd06c2fd1a56ef44d5e' 
  AND token = 'eXAssKW0ekNGMrc6+L/E4JiAE7uztfQFTKagdTEBNpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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