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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8a282ae2b643c28ce058ca3b9bdcd769c24deda9184b2160e4e353b245eb278' 
  AND token = '1ouVO6j/KZ48SW9kOre4LCu2MMNshshxFHUYZOJJjWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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