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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67877d0910b0ef018242ec527c7b585c1bbc9bdc8bc287deaa1c25bbfebc6870' 
  AND token = '7xxawmny4BFfN9XuVDn0VPyFMIKxsdC2gCD4txVjn70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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