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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7accc41f8d72199034f3545d9e2ec80a6460a50ff222135ccd5b8d185e68a115' 
  AND token = 'uz6E5kdwWQitD0M7YHk48YPumXucrIBhBQ4+NzIAyN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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