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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f3f51b82dbab4f0838b8d91332252db231f9ae53188f74250c003fd04159c1e' 
  AND token = 'E6pPPX3zu0naQ32jrBaX8DTNDD8Oep2Pw+TBuidZGUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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