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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a52ca4a141b3ac062b622ed9f767f09d83e893c77140f83e02ca0016f9ca534e' 
  AND token = 'GyHk6pLLpWlHJ2te3LphqVYK/fxuou4fYXSGiOIM4TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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