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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8cd69f4522cc2a0da86e64846fd10b93dd3cf8ebcad63fd2463884e11058c31' 
  AND token = '2XcR6d6rF4hSxQ1UYczki6E9K57JKJWFpQZ9VPT2oHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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