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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61320004e6187b91405211d46db6e61e2c3dd8f20be262b9286ba444340beb86' 
  AND token = '6wN3rQsjpSl2cK6lpZMBB5va8hHheX/M8pFmfnBc/Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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