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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d9d5d6a88ad4610170ca7890b6ad5774882cc84ee563a2d2937261a209df429' 
  AND token = 'wjnPtyll962V6yD1zULLOqEwoW0ynkvzUjGsroTmKw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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