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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94325898f8e0affdf5215edcd8c02e49622e5ea052616135633d86e4602a93d6' 
  AND token = 'lr5oba7tjnhKoAstRtALMa94j9Ybw9JYktG7bL4Rr7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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