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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6594f00e356e7fdcfc1fb7f4202a10f0e5be2b679e052ea93960d4e0a38537cb' 
  AND token = '6K+XorzxX+2+Y0xsEocRJ8n/cbsyrK8aR2v/4/zZb8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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