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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3c40f2102e42156deacedf58bb9c00acc1d7d5581b924b00aa1ef40f45880d8' 
  AND token = '8vBy4ikjA5p9eyQXgbQfcq70kNlvlYTK+cx8YC/ailg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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