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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '031c9033ac1d3e0935a86f27fc645a9efad84766acef275ded516f15d97a1e66' 
  AND token = 'sFfItL1BMTp7huuZqLkS3XbJUDhPgolfEneA0CLHqtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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