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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b49b9f64b490f9ca98a5e2c46eef2cf3503515dafef42c9e0df69a7b19f79cf0' 
  AND token = 'HxyIFybtSFYpbpC5sbFlxIVezl4p0mxN0JfqTCx2qMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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