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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba10b19da1af6fc8c6f2aa4196c0e7059e9d4c1da57dd2c47930e83bc3928e5' 
  AND token = 'OuEMffr1EsRIPT4IX6PDbqqQ3n1dxpsDz4Dm5zl2gHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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