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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a79eadfa1e815e4dcb45355ab37103393eeed49eac4c2f30cad2e65aca038627' 
  AND token = '4Pe+K72xcGhRjFYCCvxg4FXG+sa4jDMi0ecD1Jy95Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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