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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd50e4f3a196c40af678d205f0aa64ab4f9177e132c84a64984d9ff24f0356015' 
  AND token = 'fIIAPIr3HMn93/AIVeDe6WKiHdO0kQ5qubgu9iBJ6hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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