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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '084144fff85523f845d0178a6707485831f19438336d392cef254bcd9d7d5bd9' 
  AND token = 'i3RkSNnQv/3728o8o/Kk0ApDRFCAjC68uHxb0FZeuBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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