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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8373f999d1cfe29f4f25790eaf6024a05e6ccfe2a5219d38f0a07e5519a23993' 
  AND token = 'ERT9SbXVfDTyYcpzb432Hq6J8P9XziKfBm/w3syy76s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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