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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c75cdaba9d05b0daddf9c66956f0351b1a93166021c861e69734089627d6f293' 
  AND token = 'Dx6o+iAvlb01l6Z+VAGlVAIM2E7PnRW9noCRmyrw+ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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