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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9425b7e35cb63ada69104080bcd27ff28a477574b1932ced6568f0dd6ff6615c' 
  AND token = '7+KkcjT0Q2DbNSWhu6uLdXEW4FMbqIy0D18qfE2/LEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00155

JSON explain

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