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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce1c36769f6648f5409b4b535642b24f80a5a54671542dc6b7afb73861a5b2f' 
  AND token = 'oHQBc8t429qiWt85SqtJ0M0fYzUgsqzVMPkRH8sxYqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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