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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a7b3c78891d375ed4a72f42fc54bf73d02ed59d227670e83385f10044d7e3c1' 
  AND token = 'mPOEIc3XgDIzgrrGlWsTq2+JlZwz0fFAXiRztkzzPbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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