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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a31c09dd2cfd4e6dfa135864174bc980e90241291cc6a848feec41919d3a69f' 
  AND token = 'I8yaZNdUfUGINSEnT7tyZ9diHi+Y/xCEFBCjqBqqPx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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