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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11ffbb82668c409d65195e756e566a2a7e12d416bae080a9cabefebf29d93b90' 
  AND token = '99GVQJgVikCXExB4ofv15FU+oC2WSBbb5BRrO3DrS5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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