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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a828fa25178f267eacda5216ca007ad214117c93ee7479d02b2e1eadff190099' 
  AND token = 'G/poFfDsM4FuXxlVeB2tRQyakihxB0JK+jrUQElC9aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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