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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc943631a5edf6aa02b3095a8c30c0c0b86f5d89d8f5b1fe490c3d178ed7bce' 
  AND token = 'RbTflqPukcwPW1Qdj6k3ODxfWoZ4H7HyWcgJoDiXO30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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