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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39fc211b32fa389055346fb8dca468f7ce7b369a78fea54f57459020247d0b1c' 
  AND token = 'soHTdZP7BDJxrpYmJp8itJjJKp9v25NR4e0I+STLkx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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