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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5959f1f46e8e2a62f0a2400e5d65aa04343bf402bf54c93ef2f1e17b5a950ae5' 
  AND token = 'AxFGb/Q0no/rXcMZWK+dR1aAIlfKXRY9/fpHuctLKnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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