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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cb9a0fdbfa6bb99b638017c534bca41ddd9eddb762ad9fb61b6f030bd4a6c58' 
  AND token = 'wJUDLyeHHCZ1E2MtRUsPcuzxN2x6gL6ZjeeftGTafR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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