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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e75f5dae44af266a7ce7448a4f6a5e500705dfb9a751fa0262d905ac6aba0550' 
  AND token = '1MVxOQ5ibxuYvmaT2m/ugbT73JPf5kQneM6Ku0HLryM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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