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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7693c495c4a780f764305b4796043e5a39b6ca433b14354b21f7141b5e064d36' 
  AND token = 'IL5NREmULBu3raxf5zzvelNZ7axZA5VkK8O3ACUP+vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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