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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc0725664de1cf8aa19a656aa3b1d056f8f8dde5e2ad039b60013395846fc7fb' 
  AND token = 'BljNOae1eeC4Ik2uYuVTAiwQveVoeNzwhmFB6ZFV37s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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