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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cf695bc5cad8983e1fc666dc7ac999704bc59a17bc70a4bed43f0512d4f7b08' 
  AND token = 'b81OOF98yMDPcXV7SltyytB4b84yTaIDk6Zvx4oq/78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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