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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de4daf3ca7c974f292cd3a4d08b318dd2336f090688009b0c9a8f32e941e4e58' 
  AND token = 'KqGhKiw4Vg4Voyjb7gAaiAXnWDtn+SkefPD/NnMTG70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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