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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee9f8396fb330510c953f26eb307bdba29c8d6e29fc8f7488fd165e52c3f2dcf' 
  AND token = 'GmwOI3bbPvPhMO98+oUV9l0IFkYDwoSdvvqRpLyD9Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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