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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4d66a90b1507bbbb16911077ea2f142976cd89e8ed3291b5c09b360faa40808' 
  AND token = '2nt8izSomR/EgUG3OWituWXY6PAag3W7I5BSS1Hrxzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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