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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f20a6f98126fda8a85614940a04bd6b05acb09faab5cbec734e92417c6b930ea' 
  AND token = 'R8MS7NoX3N97J/pXDqpjeNe3+EV1F3pG1MNLSs/mhy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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