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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58ce2fe3a16584d1cbb795c2b0b6014a0ad19929c8b4e667bda98d595684b795' 
  AND token = 'A1KOjOx5ZGjKnhbnig4ahmTHJJVoIvUKKv5clkJwux0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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