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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba89c0872151ce7c80c298d51becee0f5b7d1609d61e605dba8576465995eba' 
  AND token = 'MhtD8zCGTxPk5QIK3iJ1+gslxfEy73eUyPYne1UAFnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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