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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e45b0e351e2edb5472b00b628764db121f88c7dacf47845c8cd3c36d7542ec6e' 
  AND token = 'Y8A+Ml8GitYwxtCze86vI6ow5r2OPObLpiv+EzrBICg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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