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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5549d9c1b35e4489a543fa06c8861b743d7b773330ac8070282f26ffe8c4bd3' 
  AND token = 'Rjt+qkaqRosZt4b0ST88AvqgHo2uSynJqi/eu+uLRzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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