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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '408a735f6326d09e0d64cc38927111ff69d38a77ab878b873012ef903e8185b2' 
  AND token = 'X0tVxp3QFU9Av1Peb5pJfoJBExzw/Hj/rNvdsvvm/8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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