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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb7284dc4aba8349aed9014289ffb6876437b7fd6f19d081018e6a5107460b73' 
  AND token = '0zID9T8SScq27wewKReV0lsvwnlv76iTdiPyT9Ee5pU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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