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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77403cd23a69a239f6a0bdb723a59973fdc8bf164a546e0d23c91de4a37211fb' 
  AND token = 'RbqtouvAT49PINw/b/w8tpTMzEOiz1tbKeysqVakUK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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