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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fdcf55eb7d5e56f012776f28da331d4e69c53cce01c315a1f7cfec3c01df3d7' 
  AND token = 'cYa0g09BR93DyNCpOcqKw2HuVjQSpe1F5fcsS6w7jbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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