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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aacc20684b860a33d2903ce661267dd88b72f1f1a0ae24809115db8b34288f11' 
  AND token = 'iTe/DEf7M9skwofTK/fF9CekF3YMCd+V8UIT9peZYpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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