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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53ccb7b8d56c3779487b129ef5e3e7d28690998eaa92bbe0fef135335bcd018e' 
  AND token = 'K2z7vbtibAxLD3NcRC4XNlOIN7Wti126tQmebiRl9Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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