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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b10f1813a1e769119a37ab11ce8b5ae515cb777413fcbcb67bf7d0791275731b' 
  AND token = 'V3F+/OaaTiN9dIgYUy4W+76ljDT+tBGMEF7p2IhwYrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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