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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62438f33eaddde22a60275a4aa5162ae416b5f2dacfbf22250196dda437e0b95' 
  AND token = 'w6gW2gnKmP2SXH0RBrfnfcZrmi9z2g/z8lvaDRadjUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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