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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f4e387e0f72bc9cae9725424a7b838eece6b279b8888f96178ee35950beeb66' 
  AND token = 'mOQ509pGJeDhSdbN8rKkEHQaDfHBb1KNA4qCH37nvKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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