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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e1c2ea87e269a6d682591cc41aec8274f3df29c36432dac5c90862a1253655c' 
  AND token = 'STpjccc5biCZtTO5Lh9wVGfKC6DybEFOC2J5flwB30I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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