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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bdf21d64de01cb2d55b07932014ed081169bf3ce2952af598ee2f2ead2c91ac' 
  AND token = 'Vhz/llXjoKmbU8qaG5BcNgJ0xm7oz9LCVDjzUcya+WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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