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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcf75d7abf4e61a94d05a82e6761719e963a1fb3bb7cb3dd35bb11bfb4333f24' 
  AND token = '8Vds4ytBhKjtsvkwT0i4vHYLMtSOZPyIhfPAKxbAP1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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