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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45c87e2e43d2fc71a7f5ebfb4b10a028c245fe787311c9087aae5f5238d8df22' 
  AND token = '4NZ9a8DH7pETbvWr3h6OmDeUK2s5liCPs3Q2LUhu6lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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