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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5cf1bc01468fca620d1a00cb8b09f2e8104831cb4c023d0e1ff8255efb3b155' 
  AND token = 'ul1l/rLeUz72TOvCTlmDK9E3pvmSLYLn+nTZND6qZGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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